Grinding machine



April 2s, 1925. 1,535,331

M, MORGAN GRINDING MACHINE Filed Feb. 3, 1921 Patented Apr. 28, 1925.

UNITED STATES MYLES MORGAN, or WoRcEs'rEa, MASSACHUSETTS, Assienon, BY MEsNE ASSIGN- MENTS, T GREENFIELD TAP AND VDIE C0IRI0-1'\A'l]l01\l',` CHU SETTS, A CORPORATION 0F MASSACHUSETTS.

GBINDING melanin.

Application led February 9, 1921. Serial No. 442,258.

To all whom it may concern.' Be it known that I, MYLEs MORGAN, a citizen `of theUnited States, residing at Worcester, in thecounty of Worcester and State of Massachusetts, have invented a new anduseful Grinding Machine, of which vthe following is a specication. The object of this invention is to improv the grinding machine yillustrated in al1 application for Letters Patent filed by Ralph L. Morgan, November 20, 1920, Serial No.'`

425,475, and in an application for Letters Patent on work-holder iiled by said Morgan on even date herewith, Serial No. 442,259.

To this end the invention consists of the means for operating the water guard or door in the manner hereinafter described, and of supplement dogs for limiting the reciproca'- tion of the work-table while the grinding wheel is trued.

The invention is illustrated in the accompanying drawing'in which- Fig.4 1 is a partial plan'view ofthe machine with my improvement applied thereto; Fig. 2 is a sim1lar view partly in section with the parts in a different position;

Fig. 3 1s an elevation showin the mounting or pivot ofthe water guar` and Fig. 4v is an enlary ed view showing the sprin for normally c osing the same.n

Re erring to the drawings and in detail, A designates the base or frame of the grinding machine on which the work-table B is mounted so as to reci recate thereon. C designates the bearin b ock mounted on the work table in which t e rotatingr work-holding spindle D is journalled, this s indle hav-l ing a work-holding bushing 24 1n which a pusher 34 can reciprocate. Y Y The spindle is preferably also provided with. the work-retaining means shown, described and claimed in said application of Ralph Ll Morgan, Serial No. 442,259, filed Feb. 3,1921.

K designates the grinding wheel and W designates the operating handle by which the reciprocation of the work-table is con-l trolled, this work-handle being mounted on a valve stem 44. These parts are arranged 5o' as shown in said ap lication andwill not be detailed in this a p ication.

A water guar or door is provlded which has a notch or hole 550 at its bottom, this door being provided for the purpose oi directing the lubricating or grindin fluid `which is pumped through the bushing down onto the work-table of the machine from which it can be drained. Y-

A bracket 56 projects from the bearing block C and in the same is secured a shaft 57 on which is journalled a hub 58 mounted on or attached to the water guard 55 a' thrust ball 59 being fitted-in the hub 58 and being engaged by a screw 60' threaded into the 'hub 58 and having a loclenut 61. A coiled spring is arranged between the hub 58 and a bolt head 63 formed on the shaft 57 so as normally to turn the water guard or door to closed position against the bearing block C. A chain or cord 64 is connected to the outermost end of the door 55 and to a stationary point as shown. l By this arrangement the water guard normally'will be kept in operative position but when the work-table is moved to extreme retracted position, which is done for calibrating or for ejection 'of the work, the water guard or door will be automatically opened. as illustrated in Fig. 1.

A shaft 65 is `secured at the rear of the machine and a sprin 66 is mounted thereon and engages a hub o an arm 67 fitted on said `shaft and pushes the same against a collar 68 adjustably secured on said shaft. Said arm carries a yoke 69 and has al clamping screw 70 at its front end. This arm can be swung over so as to come between the grinding wheel K and the work-holder when the latter is in retracted position as illustrated in Fig. 2.

A screw 71 having a suitable lock-nut is OF GREENFIELD, MASSA- Y threaded into the arm 67 and this screw car- Y ries a diamond point 72 at its endby which the grinding wheel K can be trued.l The clamping screw 70 is provided so that the front end of the arm 67 can be `clamped to the worlrtable when the armis swung over into operative position.

In addition to the stops adjustably secured on the. Vtable to control the. reciprocation thereof, as illustrated in `said application Serial No. 425,475; I provide a stop or dog 73 which is set in position to engage an arm 74 secured on the controlling handle Wand thus act to limit the backward movement; of the-work-table as shown in Fig. .1. I also 1s adjustably secured to the table. This dog 7 5 has an operating projection 76 arranged so that when the handle is pulled outwardly it will not engage the arm 74 but so that when the arm 74 is in normal position it will cooperate with the right-hand side thereof.

This dog 75 and the arm 67, when the same is pulled over into operative position as illustrated in Fig. 2, Will act as limiting stops and will limit the reciprocation of the table when the Wheel is to be trued up.

To true up the Wheel the operator pulls the arm 67 over into operative position, clamps the same at such position by screw 70 and manipulates the operating handle lV so that the same and the arm 74 thereof will come between the dog 75 and the said arm 67. When the parts are in this position the Work table Willhave a reciprocating movement sufficient to cause the yoke 69 to pass back and forth over the grinding wheel K. This leaves the operator free to adjust and watch the engagement of the diamond point with the grinding Wheel and enables the operator to true up the Wheel correctly and rapidly., lt will also be noticed that when the grinding Wheel is trued the cover or guard will remain in closed position which is advantageous in that the same Will beout of the Way, and that' the cover Will protect the work holding head from injury..

The details and arrangements herein shown and described may be varied by a skilled mechanic Without departing from the scope of my invention as expressed inthe clalms.

Having thus'fully described my invention, what I claim and desire to secure by Letters Patent is l. In a rinding machine, the combination of a reclprocating table, a Work-holding head, a cover or guard attached to said head, and a connection thereto so that the cover will be automatically opened when the table moves to retracted position.

2. In a grinding machine, the combination of a reciprocating table, a Work-holding head, a cover or guard attached to said head,

a spring arranged normally to close said cover or guard, and a connection thereto arranged so that the cover Will be opened automatically when the table is moved to retracted position.

3. In a grinding machine, the combination of a reciprocating table, a Work-holding head, a cover or guard pivoted to said head, a spring arranged normally to close said cover or guard, a connection thereto arranged so that the cover Will be opened automatically when the table moves to its retracted position, and a limiting stop for determining such retracted position.

In testimony whereof I have hereunto affixed my signature.

MYLES MORGAN. 

